German Astronaut: Image of Gaza Is 'My Saddest Photo Yet'

A picture of rockets in the skies over Gaza is "my saddest photo yet," German astronaut Alexander Gerst tweeted from the International Space Station (ISS) on Wednesday.

"My saddest photo yet. From #ISS we can actually see explosions and rockets flying over #Gaza & #Israel," said the caption accompanying the photo posted by the 38-year Gerst.

The image has caught fire on social media and has been retweeted more than 29,000 times. Gerst tweeted the photo in English and another written in German, as he has done with all of this posted photos.